Conclusions & Observations:The Opus development branch exp_lbr_tune, has solid quality improvements in 32kbps and 48 kbps.In 64 kbps and 80kbps, there are no big difference in quality between the exp_lbr_tune and the trunk Opus 1.1.

Thanks very much for this test. It not only validates my work in progress, but it also provides me with some clues for further improvements. I'm also interested in any other (qualitative) information you might have. For example, do you think the improvement at 32 kbps is mostly due to reduced noise/roughness or to the wider stereo image (or something else)?

For example, do you think the improvement at 32 kbps is mostly due to reduced noise/roughness or to the wider stereo image (or something else)?

They are of about equal contribution. I've got the good stereo image representation and reduced noise in the "better 32k" version. They are both great!On 48 kbps, only the reduced noise/roughness was significant. (Although the test is blinded, I could easily tell the 32k and 48k groups.)

Kamedo2, IgorC, thanks for the feedback. It looks like the effect I'm trying to produce is still a bit too subtle. I uploaded a variant on collapse1:http://jmvalin.ca/misc_stuff/collapse1b.wavCan you guys compare to collapse0 and see if you can hear more of an improvement?

Kamedo2, IgorC, thanks for the feedback. It looks like the effect I'm trying to produce is still a bit too subtle. I uploaded a variant on collapse1:http://jmvalin.ca/misc_stuff/collapse1b.wavCan you guys compare to collapse0 and see if you can hear more of an improvement?

BTW was it 48 kb?

Your set of samples has different kind of samples. That's excellent. But if it's possible also to try my set of samples for future tests as well, I will be glad. Samples

Your set of samples has different kind of samples. That's excellent. But if it's possible also to try my set of samples for future tests as well, I will be glad. Samples

The test was at 32 kb/s VBR, which for these hard samples averaged about 38 kb/s. If you have a way to build an Opus encoder from source, I can point you the exact version I was testing.

About the results, thanks very much for these tests. It does look like I can produce some improvement, but it's still a bit marginal. The idea in the collapse* series (except for collapse0 which was the control) is to do a sort of "gradual" intensity stereo rather than a binary decision.

If you have a way to build an Opus encoder from source, I can point you the exact version I was testing.

Sincerely, I have no anymore. Lack of time. Barely a hour or so to do a blind test. If someone here can provide binaries andIf You tell which snapshots + settings to pay attention then I'll submit some results from time to time.